Production of matrices for stereotyping and the like.



SIGVALD ALFRED CHRISTIAN KRISTENSEN, OF COPENHAGEN, DENMARK.

PBODUCTION OF, MATRICES IE OR STEREOTYPING AND THE LIKE.

Specification of Letters Patent.

Patented July 23, 1907.

Application filed August 1, 1906. S'erial No. 323,737..

To all whom "it may concern:

Be it known that I, Srevsnn ALFRED Onarsrmn Kms'rENsEN, printer, a subject of the King of Denmark, whose'postal address is Nytorv 17, Copenhagen,

, a liquid containing a fine metallic powder to the form,

and pressing the form and flong together to form the matrix, the latter when removed carrying the metallic film on its face.

The present invention relates to a liquid compound especially adapted for the above mentioned use and consisting partly of finely pulverized aluminium, partly of an adhesive and partly of a liquid and volatile solvent or suspending medium.

As an adhesive is used, according to the present invention, a substance or a mixture of substances containing starch (such as rice starch, rye flour, maize (Indian corn)-flour or wheat flour) and forming with moisture and under the influence of heat a gelatinous mass, adapted lo resist the heat, produced by the subsequent casting of the stereotype metal. glue, especially the genuine isinglass may advantageously be employed for this purpose.

As a solvent, or rather as a medium to hpld the aluminium powder and the adlu-si V0 in suspension, alcohol, othor and Hlttl'ill hydrocarbons as for instance benzino, are ominoully suitable, whereas water is entirely unfit for l he purpose. 'lho said lluids, save water, are namely both snllicivn-tly volatile to admit of a quick evaporation and oxlronu-ly liquid, llowing easily on metal and adhering thereto. 'lhcy will therefore, when they are mixed up \vilh the solid substances completely eliminate. the air from tho sumo, and when the solution is applied on lhv etching r the like, the air will also be enln i'lll'l' 'ill L my invention into effect I prefer to com pose llusolution of the following ingredients in about the followin proporl ions, viz. 2 parts by weight of rye llour, l par! of maize llour, l partol aluminium powderand sullu-h-nl. alcohol to nuikc the mixture quite liquid.

Also certain kinds of Preferably the solid ingredents are first mixed, and to this mixtureis added the liquid, little by little, until the mass gets aliquid consistency. The solution thus prepared may be preserved for any length of time, when kept in well stoppered bottles or cans, and it will at all times be ready for use, it being only necessary to shake it somewhat, in order to mix the ingredients evenly.

The solution may be applied to the surface of the form, by putting it onto th form by means of a soit brush, by sprinkling or pouring it thereon, or in other suitable manner. fiong as well, no matter whether this is in a dry or damp state, especially when the flong is to be used for the form as soon as the fluid is evaporated, or it may he; 7 0

entirely'dried and kept in stock for any length of time and is always ready for use, after having been Wetted withwater as an ordinary paper-firing.

Having now particularly described and ascertained the nature of my said invention and in what manner the'sarne is to be performed, I wish it to be'understood It may. also be applied to the paperthat I am aware, that it is not novel to produce matrices from etchings and the like by giving the form or the paper-fiong a coating by applying to the same a powder such as whiting, powderedcl'ay, plumbago or the like,

either dry or in paste form, and I make no claim to such of a matrix for stereotyping; consisting of a metallic powder, starch, and a volatile liquid carrler. V

v 4. A compound for produclngn metallic skin on the face of a matrix for stereotyping, consisting or a metallic pow der, starch; and alcohol. 5. A solution or.l1gnld compound for pro ucing a. metallic film or skin on the face 01 11 matrix for the reproductlon, by stereotyping, of type matter, etchings, electrotypes, woodcuts and the like, co'nslstlng'of a fine ul'umlnlum powder and a starchy substance held in suspension llqul d carrlen,

In witness wherep the presence of two st:

.Ve hereunto signed lbing; witnesses. p 'liafi" RISTQE Witnesses Jumps man as li -WA l 100. or stirred up in a suitable volume and "preferably highly 

